Comprehensive Truck Size and Weight Limits Study: Pavement Comparative Analysis Technical Report

Appendix O – Impacts of Overweight Axles on Initial Pavement Service Intervals

The tables that follow tabulate the number of years until predicted distress levels reach a specified trigger value (initial service interval) for the base case and under a hypothetical traffic loading that removes all overweight axles.

Medium Volume Interstate Flexible Sections With and Without Overweight Axles

Rehab Trigger at Predicted Mean Values, Raw		Geographic Location #1		Geographic Location #2
		All Traffic	No OW Axles	All Traffic	No OW Axles
IRI @	160	34.250	34.890	15.170	15.296
Rutting	0.4	26.068	31.092	4.164	5.189
Fatigue Crk @	7.5%	30.853	37.835	7.107	9.201
Change (years)		-	5.024	-	1.025
Change (pct)		-	19.3%	-	24.6%

 

Medium Volume Interstate Rigid Sections With and Without Overweight Axles

Rehab Trigger at Predicted Mean Values, Raw		Geographic Location #1		Geographic Location #2
		All Traffic	No OW Axles	All Traffic	No OW Axles
IRI @	160	22.657	23.967	29.317	32.396
Faulting @	0.15	28.553	31.398	27.487	30.424
Transv Crk @	7.5%	> 50	> 50	> 50	> 50
Change (years)		-	1.320	-	2.938
Change (pct)		-	5.8%	-	10.7%

 

Medium Volume Interstate Flexible Sections With and Without Overweight Axles

Rehab Trigger at Predicted Mean Values, Raw		Geographic Location #1		Geographic Location #2
		All Traffic	No OW Axles	All Traffic	No OW Axles
IRI @	160	38.277	39.223	35.915	36.360
Rutting	0.4	25.212	33.128	5.059	6.398
Fatigue Crk @	7.5%	> 50	> 50	13.544	18.058
Change (years)		-	7.916	-	1.339
Change (pct)		-	31.4%	-	26.5%

 

Medium Volume Interstate Rigid Sections With and Without Overweight Axles

Rehab Trigger at Predicted Mean Values, Raw		Geographic Location #1		Geographic Location #2
		All Traffic	No OW Axles	All Traffic	No OW Axles
IRI @	160	33.499	36.676	> 50	> 50
Faulting @	0.15	43.875	49.790	> 50	> 50
Transv Crk @	7.5%	> 50	> 50	> 50	> 50
Change (years)		-	3.177	-	0.000
Change (pct)		-	9.5%	-	0.0%

 

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